CN115556350A - Laser printing method and system - Google Patents

Laser printing method and system Download PDF

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Publication number
CN115556350A
CN115556350A CN202110743740.4A CN202110743740A CN115556350A CN 115556350 A CN115556350 A CN 115556350A CN 202110743740 A CN202110743740 A CN 202110743740A CN 115556350 A CN115556350 A CN 115556350A
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CN
China
Prior art keywords
laser
energy
printing
powder
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110743740.4A
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Chinese (zh)
Inventor
刘建业
牛留辉
高文华
赵崇亮
戚文军
王金海
温俊鹏
李鹏
杨桃甲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Hanbang3d Technology Co ltd
Original Assignee
Guangdong Hanbang3d Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Hanbang3d Technology Co ltd filed Critical Guangdong Hanbang3d Technology Co ltd
Priority to CN202110743740.4A priority Critical patent/CN115556350A/en
Publication of CN115556350A publication Critical patent/CN115556350A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention relates to the technical field of 3D printing, and aims to solve the problem that the laser printing method in the prior art has heat accumulation and influences the forming quality of an article. Laser printing methods and systems are provided. Wherein the laser printing method fuses the powder layer by layer with laser to form an article; controlling total energy E in real time during powder forming in printing General assembly Is constant. The laser printing system comprises a workbench, a powder spreading device, a laser device, a temperature monitoring device and a controller. Temperature monitoring means for monitoring the current printing surface(ii) temperature; the controller is connected with the laser device and the temperature monitoring device and can receive the temperature T measured by the temperature monitoring device in the printing process of each layer 0 Passing temperature T 0 Obtaining the current energy E of the printing surface 0 And further with E 1 ＝E General (1) ‑E 0 Controlling the laser device to emit energy E 1 (ii) a Wherein, E General (1) Is the preset total energy. The invention has the advantages of avoiding heat accumulation in the printing process and having good product forming quality.

Description

Laser printing method and system
Technical Field
The application relates to the technical field of laser 3D printing, in particular to a laser printing method and system.
Background
Laser 3D printing is a product manufacturing technique that builds up a shaped article layer by laser sintering of powder.
In some known techniques, heat accumulation occurs during printing, which affects the forming process or quality of the article.
Disclosure of Invention
In view of the above, the present application provides a laser printing method and apparatus that can avoid the occurrence of the heat accumulation phenomenon by controlling the total energy of the powder during printing.
Embodiments of the present application provide a laser printing method in which the laser injection energy E is adjusted in real time during printing, in some embodiments 1 So that the laser is injected with energy E 1 With the current energy E of the powder before receiving the laser energy 0 Is inversely related to enable laser injection energy E 1 And the current energy E of the powder before receiving the laser energy 0 Sum compositionTotal energy E of General assembly Is constant.
In some embodiments, during printing, the temperature T of the current print side is monitored 0 And through T 0 Deriving the current energy E 0 ；
By the formula E 1 ＝E General assembly -E 0 To obtain the required laser injection energy E 1 And according to the value E 1 The laser injection energy is controlled.
In some embodiments, by T 0 Deriving the current energy E 0 The method is to estimate by establishing a temperature field simulation model of the printing surface.
In some embodiments, the article is formed by printing in layers, each layer controlling the laser energy E separately 1 With current energy E 0 Change such that the total energy E of each layer General assembly Are all kept constant.
Embodiments of the present application further provide a laser printing system, which includes:
a table for carrying powder and/or shaped articles;
the powder paving device is used for paving powder on the workbench layer by layer;
a laser device for providing a laser for sintering the powder;
the temperature monitoring device is used for monitoring the temperature of the current printing surface;
a controller connected with the laser device and the temperature monitoring device and capable of receiving the temperature T measured by the temperature monitoring device during printing of each layer 0 Passing temperature T 0 Obtaining the current energy E of the printing surface 0 And further with E 1 ＝E General assembly -E 0 Controlling the laser device to emit energy E 1 (ii) a Wherein E is General assembly Is a preset total energy.
In some embodiments:
the laser apparatus includes a laser for generating laser light and a scanning mirror capable of controlled movement to direct the laser light generated by the laser to move along a predetermined path within the print plane.
In some embodiments:
the controller includes a regulator for regulating the power of the lasing light.
In some embodiments:
the temperature monitoring device adopts a non-contact temperature measuring device.
In some embodiments:
the laser device adopts an infrared laser device.
In some embodiments:
the powder spreading device adopts a powder spreading roller.
Drawings
Fig. 1 is a schematic structural diagram of a laser printing system according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a laser printing method according to a second embodiment of the present invention.
Description of the main element symbols:
laser printing system 10
Working table 11
Powder spreading device 12
Laser device 13
Laser device 14
Scanning mirror 15
Temperature monitoring device 16
Controller 17
Optical system 18
Powder of 19
Regulator 20
Printing surface P1
Laser L1
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Some embodiments of the present application are described in detail. In the following embodiments, features of the embodiments may be combined with each other without conflict.
The present application provides a laser printing method for melting powder with a laser to shape an article. Controlling total energy E in real time during powder forming in printing General assembly Is constant.
In some known solutions, the heat generated during the laser printing process will accumulate on the printing surface, which heat accumulation will affect the forming time of the article and thus the quality of the final formed article.
In the scheme adopted by the embodiment, the total energy is controlled to be constant in real time during powder forming, so that the maximum temperature of the powder formed at each position is ensured to be consistent with the time required by cooling forming as much as possible, and the forming quality of the article is improved. In particular, the laser injection energy E is adjusted in real time 1 So that the laser injects energy E 1 With the current energy E of the powder before receiving the laser energy 0 Is inversely related to the laser injection energy E 1 And the current energy E of the powder before receiving the laser energy 0 Total energy E formed by the sum General assembly Is constant.
Further, during printing, the temperature T of the current printing surface is monitored 0 And through T 0 Deriving the current energy E 0 (ii) a By the formula E 1 ＝E General assembly -E 0 To obtain the required laser injection energy E 1 And according to the value E 1 The laser injection energy is controlled.
Further, byT 0 Deriving the current energy E 0 The method is to estimate by establishing a temperature field simulation model of the printing surface.
Further, the object is formed by layered printing, and the laser injection energy E is controlled by each layer respectively 1 With current energy E 0 Change so that the total energy E of each layer General assembly Are all kept constant.
Example one
Referring collectively to fig. 1, the present embodiment provides a laser printing system 10 that is based on selective laser sintering technology (SLS).
In this embodiment, the laser printing system 10 includes a table 11, a powder spreading device 12, a laser device 13, a temperature monitoring device 16, and a controller 17.
Wherein the table 11 is used for carrying the powder 19 and/or the shaped article. The working platform 11 is a vertically liftable structure and is arranged in a trough (not shown) capable of containing the powder 19.
The powder spreading device 12 is used for spreading the powder 19 on the workbench 11 layer by layer. The powder spreading device 12 can adopt a powder spreading roller structure and the like.
The laser device 13 is used to provide laser light L1 for sintering the powder 19. In the present embodiment, the laser device 13 may be configured to include a laser 14 for generating laser light and a scanning mirror 15 capable of controlled movement to guide the laser light L1 generated by the laser 14 to move along a preset path within the printing plane P1. The predetermined path is the path that the laser needs to travel through for each layer of the shaped article. In this embodiment, the laser 14 may be an infrared laser 14. The scanning mirror 15 may be provided as a movably disposed mirror, and emits the laser light L1 emitted from the laser 14 to the print surface P1 by its displacement. Of course, in some cases, the irradiation position of the laser L1 may be controlled in such a manner that the laser 14 is movable.
If necessary, a suitable optical system 18 may be arranged between the laser 14 and the scanning mirror 15 to perform power amplification and the like on the laser light emitted from the laser 14 to obtain a laser beam with suitable parameters.
The temperature monitoring device 16 is used to monitor the temperature of the current printing surface P1. The temperature monitoring device 16 employs a non-contact type temperature measuring device.
In this embodiment, the controller 17 is connected to the laser device 13 and the temperature monitoring device 16, and is capable of receiving the temperature T0 measured by the temperature monitoring device 16 and obtaining the current energy E of the printing surface P1 according to the temperature T0 in the printing process of each layer 0 And further with E 1 ＝E General assembly -E 0 Controlling the laser device 13 to emit energy E 1 (ii) a Wherein E is General assembly Is the preset total energy. Optionally, the controller 17 includes a regulator 20 for regulating the power of the generated laser, and the regulator 20 controls the power of the laser to maintain a preset laser scanning speed and action time, thereby controlling the energy emitted by the laser device 13.
Of course, in other embodiments, the laser device 13 is controlled to emit energy E 1 The method of (3) can also be implemented in a manner of controlling the laser scanning speed and the action time while maintaining a constant power.
Through the scheme, the sum of the laser energy obtained by the powder 19 and the current energy of the laser energy is constant in printing, so that the defect of product forming caused by insufficient melting of the powder 19 due to too low cooling forming or too low total energy after the powder 19 is melted caused by too much total energy in the printing process is avoided.
In addition, adopt this scheme, can also avoid the influence that powder 19 preheats the temperature error and brings, need not to provide the thermostatic control case of higher control accuracy like prior art to powder 19 promptly, practiced thrift equipment cost.
Example two
Referring to fig. 2, the present embodiment provides a laser printing method based on Selective Laser Sintering (SLS). The method can be implemented based on the laser printing system 10 in the first embodiment.
The method comprises the following steps:
step S1: setting the Total energy E General assembly . Total energy E General assembly According to different powder 19 material reservations, which enable the powder 19 material to receive the total energy E General assembly The powder 19 material can then be melted and fused by cooling after the laser is removed to effect sintering of the powder 19.
Step S2: a layer of powder 19 is laid on the table 11 with a powder laying device 12. The powder-laying material can adopt the common powder-laying roller equipment.
And step S3: and (4) laser sintering. The laser device 13 is activated to scan the print surface P1 along a set path. During printing, the temperature T0 of the current printing surface P1 is monitored by the temperature monitoring device 16, and the current energy E of the printing surface P1 is obtained through the T0 0 (ii) a By the formula E 1 ＝E General assembly -E 0 To obtain the required laser injection energy E 1 And according to the value E 1 The laser injection energy is controlled. Obtaining the current energy E through T0 0 By modeling the temperature field of the print surface P1, e.g. by measuring the temperature of the points of the print surface P1, calculating the average temperature of the print surface P1 as T0 and the current energy E 0 The value of (d) can be expressed by the product of the area S, T0 of the printing surface P1 and a set constant coefficient; or E 0 The integral of the temperature of each point of the printing surface P1 on the printing surface P1 is used for representation.
For example, the laser power of the laser 14 can be controlled by the regulator 20 of the controller 17 to control the laser injection energy E 1 The effect of (1).
Of course, in other embodiments, changing the laser action time by controlling the time of the laser scanning speed, and thus changing the laser injection energy E, may also be adopted 1 The size of (2). This embodiment can be implemented by controlling the moving speed of the scanner.
And step S4: and judging whether the printing of the article is finished. If the printing of the article is not finished, returning to the step S2, and after the step S2, executing the step S3 again, and repeating the step S2 and the step S3 until the printing and forming of the article are finished. If the printing of the article is completed, the flow ends.
The laser printing method in this embodiment fuses the powder 19 layer by layer with laser to form an article, which controls the total energy E of the powder 19 at the time of forming in real time during printing General assembly Is constant. In particular, by adjusting the laser injection energy E in real time 1 So that the laser is injected with energy E 1 With the current energy E of the powder 19 before receiving the laser energy 0 Is inversely related to enable laser injectionEnergy E 1 And the current energy E of the powder 19 before receiving laser energy 0 Total energy E formed by the sum General assembly Is constant. In this embodiment, the laser injection energy E is controlled separately for each layer of printing 1 With current energy E 0 Change so that the total energy E of each layer General assembly All keep constant, thereby avoiding the problem that the forming time of the article and the quality of the finally formed article are influenced by heat accumulation during printing in the prior art, and having good industrial applicability.
Although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present application.

Claims (10)

1. A laser printing method for fusing powder layer by layer with a laser to form an article, comprising:
in printing, the laser injection energy E is adjusted in real time 1 So that the laser is injected with energy E 1 With the current energy E of the powder before receiving the laser energy 0 Is inversely related to the laser injection energy E 1 And the current energy E of the powder before receiving the laser energy 0 Total energy E formed by the sum General assembly Is constant.
2. The laser printing method of claim 1, wherein:
during printing, the temperature T of the current printing surface is monitored 0 And through T 0 Deriving the current energy E 0 ；
By the formula E 1 ＝E General assembly -E 0 To obtain the required laser injection energy E 1 And according to the value E 1 The laser injection energy is controlled.
3. The laser printing method of claim 2, wherein:
through T 0 Deriving the current energy E 0 The method is to estimate by establishing a temperature field simulation model of the printing surface.
4. The laser printing method of any one of claims 1-3, wherein:
controlling the laser injection energy E respectively for printing each layer 1 With current energy E 0 Change so that the total energy E of each layer General assembly Are all kept constant.
5. A laser printing system, comprising:
a table for carrying powder and/or shaped articles;
the powder paving device is used for paving powder on the workbench layer by layer;
a laser device for providing a laser for sintering the powder;
the temperature monitoring device is used for monitoring the temperature of the current printing surface;
a controller connected with the laser device and the temperature monitoring device and capable of receiving the temperature T measured by the temperature monitoring device during printing of each layer 0 Passing temperature T 0 Obtaining the current energy E of the printing surface 0 And further with E 1 ＝E General assembly -E 0 Controlling the laser device to emit energy E 1 (ii) a Wherein E is General assembly Is the preset total energy.
6. The laser printing system of claim 5, wherein:
the laser apparatus includes a laser for generating laser light and a scan mirror capable of controlled movement to direct the laser light generated by the laser to move along a predetermined path within the print surface.
7. The laser printing system of claim 5, wherein:
the controller includes a regulator for regulating the power of the lasing light.
8. The laser printing system of claim 5, wherein:
the temperature monitoring device adopts a non-contact temperature measuring device.
9. The laser printing system of claim 5, wherein:
the laser device adopts an infrared laser device.
10. The laser printing system of claim 5, wherein:
the powder spreading device adopts a powder spreading roller.
CN202110743740.4A 2021-07-01 2021-07-01 Laser printing method and system Pending CN115556350A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110743740.4A CN115556350A (en) 2021-07-01 2021-07-01 Laser printing method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110743740.4A CN115556350A (en) 2021-07-01 2021-07-01 Laser printing method and system

Publications (1)

Publication Number Publication Date
CN115556350A true CN115556350A (en) 2023-01-03

Family

ID=84736600

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110743740.4A Pending CN115556350A (en) 2021-07-01 2021-07-01 Laser printing method and system

Country Status (1)

Country Link
CN (1) CN115556350A (en)

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